The three books making up Volume 18 of "Research in the History of Economic Thought and Methodology" are an illustration of the goals of this series: offering a platform for both original research as well as for selections of hitherto unpublished archival materials on history of economic thought and methodology. In Volume 18-A, the research annual, the Editors Professors Warren J. Samuels and Jeff E. Biddle succeeded in assembling an excellent selection of papers on a broad range of topics. The two archival volumes edited by Warren J. Samuels, contain selections of materials that can be considered elementary to the establishment of American Economics (Volume 18-B) in the late nineteenth century, and Twentieth Century Economics in general (Volume 18-C)
John R. Commons's Investigational Economics: introduction (W.J. Samuels). Comparison between the Parsons edition and the original manuscript of the Economics of Collective Action (P. Fajnzylber, D. Heidt and M. Johnson). A comparison between common's Legal Foundations of Capitalism and Economics of Collective Action (P. Fajnzylber, D. Heidt and M. Johnson). Investigational Economics (J.R. Commons).